Date registered: Dec 2006
Vehicle: 2000 Mercedes-Benz S500. Sold: 2000 C230K, Sold: 1997 Porsche 944S
Location: New York City, NY, USA
Mentioned: 0 Post(s)
Quoted: 26 Post(s)
Have you tried jacking up the car, all four wheels off the ground, and then individually turning each wheel?
That is, to isolate, replicate the mysterious sound.
Once off the ground, with flash light in hand, you should be able to feel and see what that grinding noise is
Check the Metal Dust plate on the Braking System.
If they bent that Dust shield, you will hear a metal grinding noise.
My two cents is elevating your car and diagnosing it, carefully and methodically.
New York City, NY
United States of America